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III/31B Michigan catalogue for the HD stars, vol. 1 (Houk+, 1975)
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Michigan Catalogue of two dimensional spectral types for the HD stars.
(Vol.1, -90deg < {delta} < -53deg)
Houk N., Cowley A.P.
<Ann Arbor, Univ. of Michigan (1975)>
=1975MSS...C01....0H
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ADC_Keywords: MK spectra classification; Plate data; Spectral types
Description:
This is the first of three volumes of the University of Michigan's
catalogs of stellar spectral types for stars in the Henry Draper (HD)
Catalog. (See catalogs 3051B and 3080 for volumes 2 and 3). It is
part of a program of systematic reclassification in the MK system
of the entire Henry Draper Catalogue (HD). This catalog (volume 1)
includes all HD stars having declinations (1900.0) between -90 deg. and
-53 deg. The stars were classified visually on objective-prism plates
taken with the Michigan Curtis-Schmidt telescope at Cerro Tololo
Inter-American Observatory. The 4-degree + 6-degree prisms yield a
dispersion at H-gamma of 108 angstroms/mm, with a resolution of about
2 angstroms/mm, comparable to that of the original MK system. The spectra
were taken on IIaO emulsion photographic plates and were widened to 0.8
mm, with exposures of 20-, 4-, and 1-min.
The machine-readable catalog includes HD number, spectral type, a
quality estimate, the photographic magnitude from the HD catalog, right
ascension and declination (1900.0), centennial precessions, galactic
coordinates, and cross identifications to the numbering systems of the HD,
CD, and CPD catalogs. Separate files contain a list of the plate codes
and the remarks referenced in the main catalog file.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
adc.doc 126 936 ADC Documentation
vol1.dat 107 36382 The Catalogue, Vol.1
rem1.dat 315 4636 Remarks of Vol.1
plates.dat 32 479 List of Plate Codes
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See also:
3051B : Volume 2 of this catalog (additional declination zones)
3080 : Volume 3 of this catalog (additional declination zones)
3133 : Volume 4 of this catalog (additional declination zones)
Byte-by-byte Description of file: vol1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD Henry Draper Catalog (HD) number
7 A1 --- Case [*] '*' = sp. type lower case in printed ver.
8 A1 --- n_SpType [+] '+' if spectral type is from HD Catalog
9- 24 A16 --- SpType The Spectral type
26 A1 --- Ave_Flag *[A] 'A' if classification used is an average
27 I1 --- q_SpType [1/4]? Quality of the classification,
see ADC document (adc.doc)
29- 32 A4 --- Remark Remark (see adc.doc, Table 4-2)
34- 39 F6.2 mag Ptg Photographic magnitude from HD catalog
40 A1 --- Var_Flag [V] 'V' if star is known or suspected variable
42- 43 I2 h RAh Hours RA, epoch 1900.0
45- 48 F4.1 min RAm Minutes RA, epoch 1900.0
50 A1 --- DE- Sign Dec, epoch 1900.0
51- 52 I2 deg DEd Degrees Dec, epoch 1900.0
54- 55 I2 arcmin DEm Minutes Dec, epoch 1900.0
57- 61 F5.1 0.01min/yr precRA *Centennial precession in RA
63- 65 I3 0.01arcmin/yr precDec Centennial precession in Dec
67- 71 F5.1 deg GLON Galactic longitude
73- 77 F5.1 deg GLAT Galactic latitude
78- 87 A10 --- CPD *Cape Photographic Durchmusterung Designation
89- 91 A3 --- Plate1 * Plate code #1
93- 95 A3 --- Plate2 * Plate code #2
97- 99 A3 --- Plate3 * Plate code #3
101-103 A3 --- Plate4 * Plate code #4
105-107 A3 --- Plate5 * Plate code #5
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Note on Ave_Flag:
In this case, q_SpType is assigned the highest of the qualities used
in forming the average.
Note on CPD:
'CP' in bytes 78-79, -ZZNNNNN in bytes 80-87
Note on precRA:
Very near the south pole, some of the precessions are larger
than -99.9 min/century and these values are in the remarks.
Note on Plate*:
Each plate has its own identification code (see file plates.dat)
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Byte-by-byte Description of file: rem1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD Henry Draper Catalog (HD) number
7-315 A309 --- Remark Remarks in free form text
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Byte-by-byte Description of file: plates.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Code Plate code
7- 11 I5 --- Number Plate Number
15- 32 A18 --- Date Exposure date
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Historical Notes:
* 09-Nov-1993: list of plates added at CDS
* 08-Dec-1994: list of plates corrected by Shiro Nishimura [ADAC/NAOJ]
* 17-Sep-1996: brief description added by James Gass [NASA/SSDOO/ADC]
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(End) Francois Ochsenbein [CDS] 08-Dec-1994